Rock-drill.



G. F. SPEER.

ROCK DRILL.

APPLICATION rum) 4mm, 1912.

Patented Dec. 24, 1912.

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G. F. SPEER. ROCK DRILL.

APPLICATION FILED APR.3, 1912.

1,048,434. Patented Dec. 24, 1912.

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GEORGE F. SPEER, OF FORT WORTH, TEXAS.

ROCKDRILL.

Specification of Letters Patent.

Patented Dec. 24, 1912.

Application filed April 3, 1912. Serial No. 688,249.

To all whom it may concern Be it known that I, Gnonon Ti. Senna, a citizen of the United States, and residing at FortlVort-h, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification.

This invention relates to rock drills in which a pitman driven by a crank movement or its equivalent is provided with a directratchet connection between it and the upper end of the driving rod for rotating said driving rod, said invention being more particularly applicable to a device of this character such as that shown and described in my co-pending application Serial No. (564,551, in which a rock drill is actuated by a direct mechanical connection to the source of power such as a direct coupled electric motor.

WVhile I have shown and described in the present application, means for insuring a positive operation of the drill wlth the tull stroke of the driving member, while permitting slight relative movement between the drill and the driving member when necessi tated by reason of the drill encountering relatively hard masses, I make no claim to the same in the present application, since claims on this feature form the main subject matter of the aforesaid application Serial No. 664,551.

The primary object of this invention is to provide an improved construction, combination and arrangement of parts in a device of this character with a view to reducing the number of said parts to a minimum and providing a positive ellicient action of simple, durable and economic construction, whereby the first cost as well as the cost of maintenance is reduced to a minimum.

Other and further objects will appear in the specification and be specifically pointed out in the appended claims, reference being had to the accompanying drawings exemplifying my invention, and in which- Figure 1 is a front elevation of a rock drill embodying my improvements, parts being broken away; Fig. 2 is an enlarged side elevation of the right hand portion of Fig. 1, parts being broken away and parts shown in section.

Referring more particularly to the draw ings, a main frame 1 has suitably mounted thereon the usual feed screw 2 operated by a crank 3. Surmounting the main frame 1 in the present embodiment of my invention is an electric motor 4t provided with a driving pinion 5, meshing with a spur gear 6 on the shaft 7 journaled in a suitable bearing 8. lpon the opposite end of the shaft 7 is keyed an eccentric disk 9 carrying a sheath 10 preferably integrally formed with the upper end of the driving pitman 1.1. The lower end of the pitman 11 is provided with a ball 12, which is universally joined to a socket comprising sections 13 and 14, said sections being retained within the cylindrical socket 15 on the upper end of the driving rod 16, and cushioned with respect to said driving red by means of a helical spring 17. The upper end of the rod 16 reciprocates in the hollow guide 18, the upper end of the socket 15 being provided with a crown ratchet plug 19. Rigidly secured to the pitman 11 in any suitable manner is a dog housing 20 for reciprocably mounting a dog 21, which is resiliently pressed into engagementwith the teeth of the crown ratchet 19 by means of a spring 22, which abuts at its upper end against a threaded apertured plug 23 and at its lower end against a collar 2 1 on said dog. The lower end of the driving rod 16 is provided with a socket for receiving a drill 25, which may be retained in position by means of a key or set screw 26. As the pitman rises and lowers the driv ing rod 16, it oscillates the dog 21 angularly with respect to the crown ratchet 19. As the eccentric disk 9 is revolved in an anticlockwise direction (referring to Fig. 1), the traverse imparted to the dog 21 at the upper end of the pitman stroke, imparts a short clockwise rotation to the crown ratchet 19. The spring 22 permits the dog 21 to drag over the teeth of said ratchet during the traverse imparted to the dog 21 at the lower end of the stroke. In order to retain the dog 21 against angular movement on its own axis, a set screw 23 is threaded into the plug 23 (see Fig. 1) and projects into a slot in the upper end of the stem of the dog.

What I claim is:

1. In a device of the character described, a. reciprocatory driving rod, an oscillatory pitman operatively connected to said rod, and interengaging elements carried by said pitman and driving rod respectively for rotating said driving rod.

2. In a device of the character described, a reciprocatory driving rod, an oscillatory pitman operating said driving rod, and

ratchet and pawl carried by said driving rod and pit-man respectively for producing an intermittent rotation of the driving rod.

3. In a device=of the character described, a rotatable driving rod, an oscillatory power transmitting rod adapted to impart a reciprocatory movement to said driving rod, and driving rod rotating means comprising interengaging elements mounted respectively upon said rods.

4. In a device of the character described, the combination with a reciprocatory driving rod provided with a crown ratchet adjacent its upper end a pitman disposed above said driving rod, the lower end of said pitman having a ball and socket connection with said driving rod, and a dog resiliently mounted on said pitman and engaging said ratchet to impart an intermittent rotation to said driving rod.

GEORGE F. SPEER. Witnesses:

HARRY E. KNIGHT, ARTHUR A. KNIGHT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

